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LMC Truck



Username Post: 4l60E starts in 2nd and no overdrive        (Topic#346477)
MuddiGGer25 
Contributor
Posts: 120

Age: 27
Loc: Jamestown ND
Reg: 01-25-16
08-08-17 04:50 PM - Post#2703422    

Hey guys I've read many pages om yhe 4l60e and 4l80e. And many people say that the 4l80e fail safe mode is 2nd gear and the 4l60e failsafe mode is start in 3rd gear. But mine starts in 2nd every time and then shifts to 3rd around 30mph depending on how far the skinny pedal is down.


It's a 1994 t15 (s10) gmc jimmy 4x4, 4.3l CPI vin W, 4l60E. Both solenoids were replaced about a year ago and a half and it was shifting great ( this was my inlaws vehicle before I bought it last week so I know all the repairs and borrowed it a few times) thr ignition switch was shorted our so we replaced that about 9 months ago. The trans starts in 2nd, I have verified this by accelerating to 20 mph and moving the shift lever to 2nd and L and there is no change in RPM. Then around 30mph it shifts to 3rd and around 40 mph the torque converter will lock up regardless of whether I select 3rd or OD. If I get up to 55mph for example and set the cruise then move the selector to 3rd I can hear and feel the rpms come up just a little bit then the torque converter relocks.


Is it possible the 1-2 solenoid failed already? I know it's obviously getting power and the PCM is sending the grounding signals to the other solenoids. If anyone has a wiring diagram so I can figure out which color wire is for the 1-2 solenoid so I can ground it manually and listen for it to click that would be amazing. I don't have access to a aldl/obd 1 tool at the shop I currently work at so that's out of thr question right now. Just want to know if there is something else I should check before dropping the pan later

1988 V10 Suburban 5.7L TBI/TH350 39K on rebuild 4.10AR GM14FF/GM10SF 235/85R16 & 18.4-16.1
1988 V20 Suburban 6.2L-J/TH400 CA truck, 125K G80 14FF/ GM10 4.10AR GVWR 8,600
1977 Ford Granada ~450HP 302 2bbl/C4 27K original 2.47 215/70R14




 
LMC Trucks
Shepherd 
Contributor
Posts: 816

Loc: Lake George, NY
Reg: 11-11-15
08-08-17 04:56 PM - Post#2703424    
    In response to MuddiGGer25

Check the main plug on the trans, look for corrosion or poor connections, also make sure you have 12v at the connector, if all good, gotta get inside.



 
MuddiGGer25 
Contributor
Posts: 120

Age: 27
Loc: Jamestown ND
Reg: 01-25-16
08-09-17 05:18 AM - Post#2703484    
    In response to Shepherd

I'm sure I have 12V at the connector since it will shift between 2nd and 3rd( unless that's all mechanical) it starts in 2nd even when the shifter is in OD. If I can find the proper wiring diagram I can ground the 1-2 solenoid manually and listen for it to click

1988 V10 Suburban 5.7L TBI/TH350 39K on rebuild 4.10AR GM14FF/GM10SF 235/85R16 & 18.4-16.1
1988 V20 Suburban 6.2L-J/TH400 CA truck, 125K G80 14FF/ GM10 4.10AR GVWR 8,600
1977 Ford Granada ~450HP 302 2bbl/C4 27K original 2.47 215/70R14




 
gchemist 
Senior Chevytalk Moderator
Posts: 24007
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
08-09-17 06:44 AM - Post#2703501    
    In response to MuddiGGer25

Later today, I can pull out my 96 factory service manual. I'm not sure how different it may be. It should have a wiring diagram in it.

How many miles are on it? Anything over 130,000 miles was a good factory transmission. Others fail before then.

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
SleeperSS 
Senior Member
Posts: 2482
SleeperSS
Loc: Spanaway, Wa
Reg: 10-17-04
08-09-17 11:18 AM - Post#2703538    
    In response to gchemist

Are we going to start this again???....lol

U.S.C.G. "So others may live"

'96 S-10 SS
'02 BlaZeR2





 
gchemist 
Senior Chevytalk Moderator
Posts: 24007
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
08-09-17 04:00 PM - Post#2703572    
    In response to SleeperSS

You live in a cold climate. Texas heat eats more transmissions than tornadoes. 😜

Bad trans is how I ended up with my 95 and 96. Got them both cheap and fixed them up.

'95 Jimmy SLT (Bought @131,814)
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


Edited by gchemist on 08-09-17 04:01 PM. Reason for edit: No reason given.

 
SleeperSS 
Senior Member
Posts: 2482
SleeperSS
Loc: Spanaway, Wa
Reg: 10-17-04
08-09-17 05:33 PM - Post#2703578    
    In response to gchemist

lol at cold climate...going on 54 days of no rain...maybe a small chance on Sunday. I'm actually in the planning stage of installing g a Derale stacked plate transmission cooler.

U.S.C.G. "So others may live"

'96 S-10 SS
'02 BlaZeR2





 
MuddiGGer25 
Contributor
Posts: 120

Age: 27
Loc: Jamestown ND
Reg: 01-25-16
08-10-17 04:43 AM - Post#2703624    
    In response to SleeperSS

Lol yes I'm gonna start it again. Just haven't had much luck finding the pinout with colors for the 94 4l60e. I found the 1995 and 96+ and if the colors are the same then I'm good to go. Just don't wanna short out anything by accident.


It's got 16x,xxx miles but it did this before, lost 1st and OD, father in law had both solenoids replaced ( can't verify that the guy actually did unless I pull the pan) then the ignition switch started acting up real bad and then shorted and melted a little. So we replaced that ourselves. Then about 6ish months after the new ignition switch the trans lost OD and 1st again. That's why I was wanting to check wiring before pulling the pan and see if there is something simple causing the issue. If I can't hear the solenoid click then I know I'll have to drop the pan myself.

1988 V10 Suburban 5.7L TBI/TH350 39K on rebuild 4.10AR GM14FF/GM10SF 235/85R16 & 18.4-16.1
1988 V20 Suburban 6.2L-J/TH400 CA truck, 125K G80 14FF/ GM10 4.10AR GVWR 8,600
1977 Ford Granada ~450HP 302 2bbl/C4 27K original 2.47 215/70R14




 
MuddiGGer25 
Contributor
Posts: 120

Age: 27
Loc: Jamestown ND
Reg: 01-25-16
08-12-17 10:04 AM - Post#2703871    
    In response to MuddiGGer25

So i crawled up under it and i got the connector off, but couldnt get to the light green wire to try and ground the solenoid, too tight up in there. considering using a small cut off wheel to cut a 4"x6" access door in the body above the trans...


anyway found some other issues i gotta work on first but once i find out if its shot, ill have to learn how to change it most likely.

1988 V10 Suburban 5.7L TBI/TH350 39K on rebuild 4.10AR GM14FF/GM10SF 235/85R16 & 18.4-16.1
1988 V20 Suburban 6.2L-J/TH400 CA truck, 125K G80 14FF/ GM10 4.10AR GVWR 8,600
1977 Ford Granada ~450HP 302 2bbl/C4 27K original 2.47 215/70R14




 
LMC Trucks
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